Elevator-door safety device.



E. M. FRASER.

ELEVATOB. DOOR SAFETY DEVICE.

APPLICATION FILED 00T.21, 1911.

PatenbedAllg. 4, 1914.

lll-lll @tay m. T. M V N I impossib STAILES OFFICE y GEORGE E. sEAMAN AND'oNET'rHIRiJ To AGNES DgJsEAMAN, BOTH oF SAN oIscaeALIronNIA. A

4 j ELEvAfroEnoon fspecation. f Letters "Patent SAFETY izuiv'roii.b

Application led ctober 21,1911.. Serial No,65f6,050.l

, or operatin of an electric elevator passenger or freig t car from a station' or landing while the entrance door at any station or landing inthe system is open. f

The object of my invention is to prevent injury to passengers or 'operatives. In af system e uipped with my safety device it is (ie to operate the car' unless all ent-rancedoors are shut. Opening..any ofthe ,automatically lstops the car.

entrance doors while the car is inropera'tion In the drawings, wherein like letters indicat'e like parts: Figure 1, is a `top view of the entire apparatus with the cover removed;

Fig. 2,v is an' interior view taken on' the line X-X of Fig. l', looking'v toward the center as it would appear with the cover a: in its place., Fig. 3, is an external view ofthe conduit end; Fig. 4, is a cross section on line -Z-Z of Fig. f1, looking toward the center;

Fi 5, is an external view of l'the bolt end; an Fig.. 6, is' afsecti'on on line Y-'Y of Fig. 1looki'ng toward the center and places of contact. a A i v In detail, the construction consists of the case or box, a,lined' with a fiber inslulatiomi.' The block, u, is ofsfiber or a non-conductor carryingthe spring brass contactblades, t, which are secured by the block screws, g. The block u is held in position by 4the lscrews c, which pass through that portion' of the block designated by the letter e, 'and the same extends to the underside of the cover-VV insulatioii, 1 and acts as a barrier or iirewall between the two points, e, at `which places are connected the wires@ and b,which ead'to the electric magnet device (not shown vbut a necessary part of the elevator apparatus) which regulates and `controls the elevator, operating power. These wires, b and b,

are cai-riedvfrom the said. magnet control through a conduit (notfshow) to* sta-l tion door where myfsafety device islocated'.. The hub, .fw, ofthe box, a, is tlhreadedto re- -Eiuoiwist..ifiiAsiEii.y or SAN FRANoIs'co, CALIFORNIA, AssIGNoaoi ONE-ruim) iro..v

'..meneame-4;im.

ceive the said conduit. The wires,l b and b,

pass through the said conduit vanden ter..fthe

box, o, through the hub, w, and`the`holes, 7)',7'

cut in the insulation,

` The bolt, Z, Figs. l and 2, is shown to bein contact csition with .the blades, t, as it will be held saine is closed. I/Vhenthe door is opened the action of the spring, n, will force thebolt, Z, out and away from contact with the said blades, t, to a position indicated by the dote ted lines, m. In closing, the door strikes the rubber bumper, 0, on the end .of the bolt, l, and forces the same into the position shown bythe drawings (Figs. 1 and 2). When the door is closed a completer wipe contact is made between ,the two blades, t, by the hard copper plate, h, attachedto the fiber block, 8,

by the elevator door when the,V

b the screws, j. The contact blades, t, are y s otted, 'as at a', to give a,sure bearing or the said plate h.. The block, s, is fastened t0 `the-bolt, l, by the screws, 7'". In the bolt,`l, is a groove or slot, Is, which acts as a guide in conjunction 'witli the post, g. Behind the ost, g,and insidev of the bolt, Z, there Ais a eavy spring, n, which forces the said 1bolt into the position indicated by the dotted lines, m, when the elevator door is opened.

As long asithe door remains open and the bolt, l, is in this position (m) with the contact surfaces `of the members k and t apart the circuit' is disconnected and the car is then without power and cannot be'. started. It is necessary, therefore, that the circuit mustbe completed by closing the door before the car can be operated.

The holes, f, are provided so that the box,

a, may be fastened`in position f.on the inside -face of the elevatordront or grill-work at a point vnear the top of thev door. Holes, d, are providedl with threads tor receive the screws, y, which lhold'the cover plate, in position. Screwv p is tapped into thefend of the bolt, l, to hold the rubber bumper, 0, in

position.

It will be noted thatmy device easily accessible, .dust`proolf and perfectly insulated. `The conta-ctl is always assured is compactf and that there is lno possibility of a jump or' Y a hanging fire. y

Having thus described myy invention what I claim' and desirel to secure by Letters Patentisf"` l. A safety switch for elevator doors, including an inclosed base; a'pairof linsulated contacts fixed on said base ,fa post extending above the plane of said base; a plunger having a slot engaging said post; a contactor mounted on said plunger in alinement with said liked contacts; and a sprin inter-v posed between said post and the en of the sltin said plunger.

' 2. A safety device for elevator doors including a base; a pair of insulated contacts fixed on said base an insulated block having a wip- 'end o 1 In testimony whereof I have hereunto set presence of two subing contactgplat thereon slidaible between said contacts; a plunger xed to said insulation block; aslot in said plunger; apost on sald baseextending through sald'slot; and a sprin interposed betweenfsaid post and the said'slot.

myY signature in the s'cribing witnesses.

I EMQRY M. FRASIER. Witnesses: Y y

GEO. TJDUNLoP', 'A -EQ S. 'VHUTH. 

